# O Level Physics 2016 Solved Past Paper 1

Here is the Solved Past Paper of O Level Physics Summer 2016 Paper 1. You can solve the paper online on our website.

### Solutions:

1. Use head to tail rule. Head of one vector connects with the tail of the other. The resultant runs from the tail of the first to the head of the last vector in the connected diagram. D.
2. Vectors have both, direction and magnitude. A.
3. The circumference can be found by rolling a tape around the ball. D.
4. Acceleration is the rate of change of speed and is depicted by the gradient in a speed-time graph. The gradient is zero (flat line) in the given range, hence D.
5. acceleration = force/mass. Net force = 60-20 = 40N. m=25kg. 40/25=1.6m/s^2. B.
6. Resultant force in circular motion acts towards the center of the circle. B.
7. Newton meter measures gravitational force, in Newtons. A balance, balances two masses. C.
8. Mass is the amount of space it occupies only which is unchangeable. D.
9. Sum of all moments is always 0. 60(20+30)=30w. w=100N.
10. Stability increases as the center of mass is lowered. A.
11. Gravitation potential energy is mass x gravity x height = 250 x 7 = 1750N. This energy will be used in overcoming friction. 1750-1300=450N.
12. Geothermal energy  is extracted from the Earth. Wind and Solar are also renewable. Only Nuclear energy isn’t.
13. Atoms combine in nuclear fission, which is the power source of the Sun. C.
14. Work done = force x distance = 300 x 5 = 1500J.
15. Pressure in liquids = depth x density x gravity. Density and gravity are the same, so compare depths. The depth is greatest in C.
16. P1V1 = P2V2, 6×1=3xX, X=2. A.
17. The heat will give them KE which will cause them to move faster. C.
18. Radiation is infrared which in on the electromagnetic spectrum and has the speed of light. A.
19. Wavefront is all the highest points (crest) joined together.
20. Wavelength is the distance between to troughs, or two crests. D.
21. i and r are both measured from the normal (perpendicular). C.
22. Rays incident on the lens are refracted towards the focal length. B.
23. The refractive index = sin (incidence) / sin (refraction). Using this formula, we can compute the angle of refraction is 34. A.
24. A, C and D are false. B is true. B.
25. Gamma rays are used in radiotherapy. B.
26. Loudness is proportional to amplitude and pitch is proportional to frequency. B.
27. The compass follows the field of the magnet. C.
28. The positive charge on the rod will repel the positive charges in the ball and attract the negative one’s. D.
29. Current = charge / time. Time is 240 seconds. Hence, charge = 2 x 240 = 480C. D.
30. Volt is the work done per unit charge. D.
31. The combined resistance of two resistors in parallel is least. C.
32. Resistance = voltage / current = y-axis / x-axis = gradient. The graph with the larger gradient has the larger resistance. Since resistance is inversely proportional to cross sectional area, the one with the lower resistance has the greater area. B.
33. The switch is placed on the live wire and after the fuse.
34. Since, V=IR. Select an option which gives resistance close to the given 5 Ohm. A.
35. Every half turn, the ring turns and changes the direction. B.
36. A diode let’s current pass on one direction. A is the diagram of a diode. A.
37. We need the LDR to have lowest resistance and thermistor to have highest possible resistance. That is achieved in cold and bright conditions. B.
38. Beta particle is an electron.
39. Two half lives have been spanned so we need to double the count twice. D.
40. It has 7 electrons, 7 protons and 15-7=8 neutrons. C.

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